Why does JavaScript only work after opening developer tools in IE once?

by

It sounds like you might have some debugging code in your javascript.

The experience you’re describing is typical of code which contain console.log() or any of the other console functionality.

The console object is only activated when the Dev Toolbar is opened. Prior to that, calling the console object will result in it being reported as undefined. After the toolbar has been opened, the console will exist (even if the toolbar is subsequently closed), so your console calls will then work.

There are a few solutions to this:

The most obvious one is to go through your code removing references to console. You shouldn’t be leaving stuff like that in production code anyway.

If you want to keep the console references, you could wrap them in an if() statement, or some other conditional which checks whether the console object exists before trying to call it.

More Related Contents:

  1. addEventListener in Internet Explorer
  2. 5 stars and the golden 5 stars are not together (When browsing with Internet explorer)
  3. .trim() in JavaScript not working in IE
  4. javascript document.getElementsByClassName compatibility with IE
  5. Dropdownlist width in IE
  6. Detecting the onload event of a window opened with window.open
  7. “Object doesn’t support this property or method” IE10/11
  8. adding custom functions into Array.prototype
  9. Input placeholders for Internet Explorer
  10. Why does an onclick property set with setAttribute fail to work in IE?
  11. Can I force a link to open in a specific browser?
  12. Does IE8 out-of-the-box have support for ‘localStorage’
  13. What causes the error “Can’t execute code from a freed script”
  14. How to make Internet Explorer emulate pointer-events:none?
  15. How JavaScript closures are garbage collected
  16. Code with classList does not work in IE?
  17. SCRIPT438: Object doesn’t support property or method IE
  18. How can I target only Internet Explorer 11 with JavaScript?
  19. How to set HTML content into an iframe
  20. Forcing a DOM refresh in Internet explorer after javascript dom manipulation
  21. Best way to check for IE less than 9 in JavaScript without library
  22. How can I detect Internet Explorer (IE) and Microsoft Edge using JavaScript?
  23. JQuery Ajax post parameters sometimes not sent on IE
  24. How to trigger script.onerror in Internet Explorer?
  25. How can I use console logging in Internet Explorer?
  26. IE10/11 Ajax XHR error – SCRIPT7002: XMLHttpRequest: Network Error 0x2ef3
  27. IE’s toLocaleString has strange characters in results
  28. Modal Dialog without jQuery
  29. Why does IE nuke window.ABC variables?
  30. OnChange not firing in IE

Leave a Comment